head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Competitive PvP
Supercell's snappy top-down team brawler built around three-minute objective fights.

Execution · Competitive PvP
Basketball shot-timing and scheme-reading against human or scripted defenses.
Brawl Stars leans Execution (Competitive PvP); NBA 2K13 leans Execution (Competitive PvP).
NBA 2K13 leans a little harder on execution, though the gap is small.
Brawl Stars
Aim, dodging, and ability timing in real time
NBA 2K13
Stick handles and shot release timing decide possessions
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Brawl Stars
Human teams rotate, bait supers, and adapt
NBA 2K13
Online play is constant scheme and tendency reading
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Brawl Stars
Bush ambushes and power-cube spawns hide information
NBA 2K13
Shot RNG and loose-ball physics add noise
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Brawl Stars
Brawler matchups and map strategy are learnable
NBA 2K13
Playcalling, rosters and matchup exploits reward study
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.